21002153051 has 8 divisors (see below), whose sum is σ = 23287037808. Its totient is φ = 18779868000.

The previous prime is 21002153033. The next prime is 21002153069. The reversal of 21002153051 is 15035120012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21002153033) and next prime (21002153069).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21002153051 - 2¹⁴ = 21002136667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002153251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15649220 + ... + 15650561.

It is an arithmetic number, because the mean of its divisors is an integer number (2910879726).

Almost surely, 2^21002153051 is an apocalyptic number.

21002153051 is a deficient number, since it is larger than the sum of its proper divisors (2284884757).

21002153051 is a wasteful number, since it uses less digits than its factorization.

21002153051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31299853.

The product of its (nonzero) digits is 300, while the sum is 20.

Adding to 21002153051 its reverse (15035120012), we get a palindrome (36037273063).

The spelling of 21002153051 in words is "twenty-one billion, two million, one hundred fifty-three thousand, fifty-one".